Kdc-135 preamp help

Okay, so my kenwood kdc-135 has one preamp output which is hooked up to a pair of subwoofers at the moment. I was planning on adding another amp and re doing all the door speakers with JBLs, I already have everything to do it. I was just wonder if I would need another pre amp output to do so, or if I could split it or something. Any options? or would I need to get a head unit with 2 preamp outputs?

Re: Kdc-135 preamp help

is it another sub amp or for midrange? if for subs you can split it but will also split the voltage. if for mids than either get an loc or if amp has high level in you can connect that way. High level is more likely to induce noise but can be done right.